Quicksilver Audio 120 Mono's. New a little outside your budget but worth looking into. Probably not much luck finding a used pair.
Not tubes, but I'll throw this out. Used ModWright KWA 100 SE. Will sound sweet on Vandy's, with no heat or tube replacement cost over the years. Add a ModWright LS100 preamp and you're good to go, especially if you pick one up with the phono option. Vandy 2Ce's are already sweet sounding speakers so don't be afraid to throw a great SS amp on them, especially with a tube preamp.
Not tubes, but I'll throw this out. Used ModWright KWA 100 SE. Will sound sweet on Vandy's, with no heat or tube replacement cost over the years. Add a ModWright LS100 preamp and you're good to go, especially if you pick one up with the phono option. Vandy 2Ce's are already sweet sounding speakers so don't be afraid to throw a great SS amp on them, especially with a tube preamp.